I just watched it and I have a big goofy smile on my face. It was a blast!
I was even screaming with glee at some of the names in the end credits. I'm a little sad that Monty was voiced by Eric Bana instead of Jim Cummings (when he did voice several other cameo characters in this movie), but what got the biggest reaction from me was Baloo voiced by Steven Curtis Chapman! He's a huge fan of Baloo and had been trying to get to voice him in a major Disney project for years, going all the way back to 2003 for The Jungle Book 2 (in which the role was instead given to John Goodman), and now he at long last gets to voice Baloo in this movie! This has been a LONG time coming!
And the cameos! OH THE CAMEOS!!! This was straight up Roger Rabbit levels and then some! A certain "ugly" one was arguably the biggest surprise of them all.
And then there's the notion that this movie insinuates that Toons do age over time, growing from childhood to adulthood, rather than always staying the same. And yet, there's very little consistency with that, since a bunch of the cameos are of older Toons from way back when who look to have not aged at all in the present day. One particular Toon who did grow up into an adult briefly shares a scene with another Toon that he used to work with, but said other Toon was still a child who never aged at all. That's a bit odd.
This movie was insane and had very little to do with the actual Rescue Rangers TV series, but if you instead look at it as just another movie set in the Roger Rabbit universe where Toons and humans coexist, you'll have a fun time.
This film is just one big unabashed love letter to animation in all forms.